lollipop root on G900A discussion topic

On the G900A shipped from AT&T we have a locked bootloader, and there is no known existing workaround to unlock it correct?

So given that, root was achieved , then safestrap was developed so we can currently flash roms that use the stock bootloader and kernel image, however we can customize the OS as long as the kernel and loader are untouched.

If the bootloader stays locked, what is known regarding safestrap and lollipop?
Can we still rollback the stock kernel to achieve root, then roll forward and keep it?
If that is the case, then when the stock AT&T lollipop is released, some level of ROM development can occur?

I am confused somewhat by all the discussions surrounding this, and didn't see any threads to discuss it specifically.

G900A and G900AZ topic

I read that the Cricket Galaxy S5 (G900AZ) is a rebranded AT&T S5 (G900A). Has anyone tried ODIN flashing the stock AT&T rom on the Cricket model?

For instance, i have read people flashing the Tmobile S5 stock rom on the MetroPCS version and it works fine even though the model numbers are slightly different. It changes the phone into the Tmobile version.